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United States Patent | 5,696,498 |
Lee ,   et al. | December 9, 1997 |
An address encoding method and an address decoding circuit therefor is disclosed. In the address encoding method, a part of the outputs of address latches are made to designate circuits to be controlled, and the rest of the outputs are made to designate the relevant addresses of the circuits to be controlled. Based on this method, the constitution of the decoding circuit becomes simple.
Inventors: | Lee; Jun Ho (Seoul, KR); Cho; Seong Jae (Kyungki-do, KR) |
Assignee: | Samsung Electronics Co., Ltd. (Suwon, KR) |
Appl. No.: | 937751 |
Filed: | September 1, 1992 |
Jan 09, 1992[KR] | 92-182 |
Current U.S. Class: | 340/825.52 |
Intern'l Class: | H03K 003/00 |
Field of Search: | 340/825.52,825.53,825.07,825.02,825.03,825.1,825.21,825.84,825.51,825.87 370/67,119,359,427,542,544,362,536 341/26 307/239,241,242,445 371/10.1,10.2,10.3 395/166,311,312 |
3903499 | Sep., 1975 | Oliver | 340/825. |
4570154 | Feb., 1986 | Kinghorn et al. | 341/26. |
4571587 | Feb., 1986 | Higginbotham et al. | 340/825. |
4716410 | Dec., 1987 | Nozaki | 340/825. |
5208781 | May., 1993 | Matsushima. |
IBM, Technical Disclosure Bulletin vol. 32 No. 11, Apr. 1990, USA, "Advanced Synchronous Data Link Control". Texas Instruments, The TTL DataBook, Second Edition; 1976; USA; pp. 7-157 to 7-158g "Data Selectors/Multiplexers"; pp. 7-165 to 7-166, Dual 4-Line-to-1-Line Data Selectors/Multiplexers; pp. 7-175 to 7-176, Dual 2-Line-to-4-Line Decoders/Demultiplexers; pp. 7-181 to 7-183, Quadruple 2-Line-to-1 Line Data Selectors/Multiplexers. Texas Instruments, "Supplement to The TTL Data Book", Second Edition; 1981; USA; pp. 19-22, 3-Line-to 8-Line Decoders/Demultiplexers with Address Latches. |
TABLE 1 ______________________________________ Circuit Address Circuits Addresses of designating designating to be circuits to be part part controlled controlled A7 A6 A5 A4 A3 A2 A1 A0 ______________________________________ A AD1 1 0 0 X 1 0 0 0 AD2 1 0 0 X 0 1 0 0 AD3 1 0 0 X 0 0 1 0 AD4 1 0 0 X 0 0 0 1 B AD5 0 1 0 X 1 0 0 0 AD6 0 1 0 X 0 1 0 0 AD7 0 1 0 X 0 0 1 0 AD8 0 1 0 X 0 0 0 1 C AD9 0 0 1 X 1 0 0 0 ADA 0 0 1 X 0 1 0 0 ADB 0 0 1 X 0 0 1 0 ADC 0 0 1 X 0 0 0 1 ______________________________________ In the above table, X represents "don't care".